--- build/pkgs/pynac/spkg-install.orig	2014-08-11 20:52:14.220516400 +0700
+++ build/pkgs/pynac/spkg-install	2014-08-11 20:52:27.906551659 +0700
@@ -31,6 +31,7 @@
 
 build_pynac()
 {
+    chmod -R g-w ${PYNACDIR}
     cd ${PYNACDIR}
     PKG_CONFIG_PATH=${SAGE_LOCAL}/lib/pkgconfig; export PKG_CONFIG_PATH
     ./configure --disable-static --prefix=${SAGE_LOCAL} --libdir="$SAGE_LOCAL/lib"
